Try something like this (run anywhere sample)
| gentimes start=-1 | eval _raw="{
\"LogName\": \"ExampleLog\",
\"CorrelationId\": \"f879095a-0109-4235-8ba8-218f43f27220\",
\"LoggingLevel\": \"All\",
\"ThreadId\": \"9\",
\"LocalTimeStamp\": \"2016-01-28T14:38:36.748986-05:00\",
\"AccessModeName\": \"ABC\",
\"AgentCode\": \"00000\",
\"AgentPrefixCode\": \"CA\",
\"ApplicationName\": \"UQ\",
\"ChannelCode\": \"DI\",
\"CIFCommonSchemaVersionNbr\": \"V0200\",
\"CIFGeneratedSchemaId\": \"05c0b8a4-2954-4fb7-a6ae-def569bd4b63\",
\"CIFSoftwareVersionNbr\": \"1.2\",
\"DataCenterLocationText\": \"None\",
\"InstrumentationLogDateTime\": \"/Date(1454070556298)/\",
\"LoggingComputerSystemName\": \"mycomputer\",
\"LoggingLevelName\": \"Critical\",
\"MessageText\": \"Hello world\",
\"OperatingEnvironmentName\": \"Development\",
\"PartyLogonIdTypeName\": \"None\",
\"TransactionDataXML\": \"<application><GUID>0091ef6c7-7d6b-4374-ac6b-8ec67abc6a9630080</GUID><name>Test</name></application>\",
\"TransactionDateTime\": \"2016-01-28T14:38:36.729986-05:00\",
\"CIFSchemaValidationErrors\": [
\"AccessModeName should be 10 characters\"
],
\"CIFSchemaValidated\": true,
\"Custom1\": \"Custom1Value\",
\"EventId\": 0,
\"CIFUniqueMessageId\": \"f879095a-0109-4235-8ba8-218f43f27220\"
}" | table _raw | spath| spath input=TransactionDataXML
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